dimpfel



F. P. DIMPPBL. STEAM BoILB.

- No. 7,506. v Patented July 1e, 1850.1

o o O o o o 00000000 o STATES f F. P. DIMPFEL, `or PHmanELPHIA,`PnNNsrLi/ANIA STEAM-BOILER.

Speccaton of Letters Patent 1`\To..` 7,506, dated Julyil, 1850.

`exact description of the construction and l operation of the same.

. The same letters indicate like parts in all A the figures.`

The principle of the first part "ofmy invention relates to the.employment of tubes or `pipes withina boiler which communicate inthesame and required direction, the bends Q in the said tubes at the sametime giving the4 7 `required elasticity to yield to the expansion.

at both ends with the body oflwater in the boilerV and through which thewater circulates, andconsistsin making such tubesor pipes with Vone endbent upwhensuch bent up` ends are attached to the crownplate'ofV theboiler or the plates forming the sides or end of the iireboX ortlue ator near `the junction with the crown plateprovided the other end isattached to a water space of. the

flue and at `or near the end lof the same subi stantially as'hereinafter described whereby the water is caused to circulate freelythroughwsuch tubes and is freely delivered out of the "bent `up endswithoutalny.` counterwater through the tubes is always insured andcontraction 4due to the changes of temperature to which they arenecessarilyeX- y' wateris supplied to this space freely and by posed.And thislpart of my invention also `consists in combining such benttubes with a water bottom of any form `whatever i or `other bottom`water communication which will freely supply water tothe space withwhich the straight ends ofthe tubes connect by means of whichcombination a full sup-.

ply of water is given to insure the circula-` tion through the tubes7and which at theV same time prevents the overheating of the` kplate orplates to whichthe straight ends of the tubes are attached,` andconsequently avoids the evil effects which otherwise would; take place,for the heating of the plate tends to repel and drive up'the water andhence. prevents it `from entering the tubes freelyj But by thearrangementlherein specied the the rapid circulation prevents" in` agreat measure the heatingwfjthe plate to which theends of the tubes areattached., and `hence admits `of the more free circulation of the waterinto the tubes. This part `of my invention also consists in connectionwith bent tubes attached at oneend within somepart of the flue inattaching the bent `up ends `of the exit tubes to the crown plate orroof of the fireboX that the current of water through the tubes may bedischarged over the said crown plate or roof` and thus prevent theoverheating thereof, for the heatin the firebor;` acts upward andimpinges on the under surface of this plate and tends to heatit to ahigh degree and if by accident the water be suffered to sink below itsoon becomes surface ofthis plate and thus keep it covered y with waterevenafterthelevel of the body of water in the `boiler has.; fallen belowit.

posed to the effects ofintense heat are fully protected.

`801 In this way the partsof the boilermost eX-` The second part of my`invention consists in combining with the `bent up tubes ati tachedtothe crown plate of the iirebox the making .of such crown plate with aring or projection around the "edges thereof,` the `better to retain onits surface the water dis- .charged into it by `the circulation throughthe tubes. l The third part :ofmy invention consists abovethe Vsurfaceof :the crown plate or other plates `on one side of `which the yfire `orproducts `ofacombustion acts to `which `in extending the bent upends ofthe tubes i i they are attached when the other end. of the tubescommunicate `with a water space or body of water below: or farther from``the fireboX than the said bentupends whereby the disturbance of thewater Aabove `the crown sheetor other plate to which the bent4 lupfendsof the tubes are attached is avoided.

And the last part` of my` invention consists i `in `giving a forcedcirculation to the water `in steam bollersor generators by mechanical`means wherebythe water 1s caused to pass `with greater velocity `overtheheated` surface and thereby `to take'up the `heat more rapidly.`

`In the accompanyingdrawing". `represents the external shelloftheboilerwhich may be of any desired form and (b) the fire chamber;within the shell is arranged. a series of water tubes or pipes (c) whichare secured at the back end to a vertical plate (1d.) which plate (a) isat such distance from tie end plate or head (e) of the boiler so as tohave a spece (f) for Vthe free admission of water to thisend of thetubes or pipes. The other ends of the said tubes or pipes are curved orbent upward and attached to the roof orcrown plate (g) whichruns back toand is connected at the back end with i V`'end with a vertical l yorcrown plate constitutes the fire flue which leads from the furnace tothe chimney (2) so that the flame and other products of combustion inpassing from the furnace to the chimney act first on the curved or bentupy part of the tubes or pipes and then in passingtoward the chimney acton and impart heat to the external surface of all the water'tubesorpipes; the most intense heat being'applied to the curved or bent ends ofthe tubes which first receive the action of the v plate heat. rIheproducts of combustion also heat the plate which isthe inner shell ofthe waterV space surroundin the iiue and which constitutes the watert(fiottom. The tubes being bent or curved upward as the water in them isheatedl and rarefied it will tend to rise in the curved-end; and thusestablish Va rapid circulation through the entire length, and as theirlother end is connected with the body'of water at the back and when thewater is not heated to so intense a degree, the vcirculation in thetubes or pipes will be fully supplied. The water space (j) between theand the outer shell of the boiler, as well as the space (f) at the backare closed attop from the back to the space around the furnace yor firebox,V and the crown plate or fire roof to which` the bent up ends of thetubes are yattached,-is surrounded by a rim v(p) two or more tubes (g)Vforni communications. between the space above the crownplate and theVlower end ofthe space (le)y around the fire-box; and this space (7c) inturn communicates (asindicated by the arrows). with the space (j) whichas stated Y vconstitutes the ywater bottom; The effect of thisarrangement will be that as the water Aabove thecro-wn plate orfire-roof cannot :pass down the side or back spaces (j) and txvwill rundown4 the tubes (g) to the bottom or lower part of the spaces (k) surrounding the'furnace or fire-box and thence through the water bottom tothe space (f) to supply the circulation in the tubes. The currentthussupplied to the space (f) ,which cannot rise above the covering ofthe said space (f), by reason of its being closed up at top, willeffectually supply the tubes; for if the said space (f) were open at topand not connected with the water-bottom, the heat which the plate (d)receives from the impingement of the products of the combustion inpassing through the flue, would haveV the effect to repel the water fromthev surface of the plate vand to induce an upward circulation in thesaid space (f) so rapid as not to give an adequate. supply of water tothe tubes. And asthe curved and bent up ends of the tubes are eitherdirectly over or nearest Vto the fire chamber, they willV be more highlyheated than the rear ends, kso

that the water by its circulation'through the tubes or pipes will movein a. direction the reverse of the current of heat as it passes from there-chamber to the chimney'thu's increasing the absorption' of heat bythe water.r f Y f The bent up vvends of thetubes are Vefitended abovethe vroof or kcrowngplate as at (m) which will induce amore rapidcirculation and avoid the .agitation of the water on the surface of theroof around the tubes.

TheV shell of the boiler at the horizontal end of the tubes or pipes maybe perforatedV as at (n) with a series of holes corresponding with thebore of the tubes?, for which one large hole for the'whole series;covered withV i a plate in the mannerof a man hole may be substitutedfor giving access to the tubes or pipes for cleansing or repairing them.

A shortdistance above the top-flue-'plate there is a cylinder or case(1') provided withr a reciprocating Vpiston (s) the .rod (t) of whichpasses through the headof'the boiler that it maybe connected with anymoving part of'thevengine .or any other rst mover to e' give it areciprocating motion. The said cyl-v inderis provided on one side withtwoinduction valves (u. u.) one at each end, and on the other side withtwo veduction valves .(fv. o.) discharging into a pipe leading down intoone of the outer spaces. It will lbe obvious fromthis that thereciprocating motion of the piston will produce a current of water downvthe water space in which the pipe .is located and that this willV inducea circulation through the boiler to return the water to the inductionvalves Vof the cylinder, and in this way establish a circulation of thewater over the heating surface of the i Vboiler with a velocitydependent on the capacity vofthe cylinder' and the motion of the piston.t

I do not wish to limit myself to the precise construction herein abovedescribednor to the employment ofall thevvariousparts 'ofV` j myinvention in connection, as the construction and arrangement'of partsmay be var1- ously modified within the range of the several parts of myinvention and improved results can be obtained from the use of one ormore of the improvements enumerated as constituting the several parts ofmy invention without the others, although the best results will beobtained when all of them are used in connection, as they either dependupon or assist one another in effecting the special purposescontemplated by me, viz: the more rapid, safe and economi` calgeneration of steam.

As to the mechanical means for producing a forced circulation of thewaterthrough the boiler any other known mechanical arrangement may besubstituted for that herein described, such as rotating valves orpaddles, duck foot paddles, and a variety of others not necessary toenumerate.

What I claim as my invention and desire to secure by Letters Patent,isfl. Arranging a series of bent water tubes within the flue space of aboiler, and connected at each end with the body of water in the boiler,substantially as herein de scribed, by means of which the circulation ofwater is greatly increased, and the injurious effects due to expansionand contraction avoided, substantially as described.

2. I also claim surrounding the crown sheet to which the ends ofcirculating tubes or their equivalent are attached with a rim,substantially as and for the purpose specitied.

`lower end communicates with a water space or spaces below or beyond theplate to which the upper ends are attached, substantially as and for thepurpose specified. a

I am aware that a patent was granted to Richard Prosser in` EnglandFebruary 1839i---see` Newton Journal Vol: `l5 conjoined series pageE271d in which are represented circulating tubes with one end projectingabove a plate. I do not claim such arrangement, believing that describedby me to be substantially dierent, and producing an entirely differenteffect.

4c. Giving a `forced circulation to the water through the boiler orgenerator by mechanical means, substantially as and for the purposespecied. i

F. P. DIMPFEL. Witnesses:

ALEX. Polman BROWNE,

C. BRowNE.

